Abstract

A detector-based absolute scale for spectral irradiance in the
380–900-nm wavelength region has been developed and tested at the
Helsinki University of Technology (HUT). Derivation of the scale and its use
for photometric and colorimetric measurements are described. A thorough
characterization of a filter radiometer, constructed from a reflection trap
detector, a precision aperture, and a set of seven temperature-controlled
bandpass filters, is presented. A detailed uncertainty analysis of the scale
indicates a relative standard uncertainty of approximately 0.2%
throughout most of the wavelength region. The standard uncertainties obtained
in measurements of correlated color temperature and luminous intensity of
three Osram Wi41/G tungsten–halogen lamps are 2 K and 0.3%,
respectively. The spectral irradiance scale is compared with the HUT luminous
intensity scale. The agreement of the results at the 0.1% level is well
within the combined standard uncertainty of the two scales.

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